Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89c4d11beffcc8e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 11:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e38c31c011f3eae6ac7b1db593ce2d41 SHA-1: 6d32f0686d99d908cd20d549dfd3c22f31e46a86 SHA-256: e89c4d11beffcc8e812466cba1ec24005246e3fb975e4c156a692cde28099ee0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically referencing 'hack mod instagram', suggesting a phishing or social engineering lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the document is part of a link farm designed for disposable hosting, typical of phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=hack+mod+instagram PDF link annotation
    • https://weeb.nu/userfiles/file/gezukogemiza.pdfIn PDF document text
    • https://agrando.cz/files/file/97064523237.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/fadovubevugozerenutowube.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/63220305900.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/rajeveges.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/4897449514.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/15941458484.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/81971492425.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/rokikanetulusegedewoja.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/62074340473.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613269ac990ab---95394795033.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/35382338134.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/51565907725.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/70180978255.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/47438056947.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/18273780208.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/72043594980.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7b77e8ac---39302877782.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/liwinalufubegexob.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/rokapurafusuzed.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/tufuzubulefiforodu.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/pubeluwawog.pdfIn PDF document text
    • http://4darchitecture.org/img/all/54904603103.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/pipasavoxuzulo.pdfIn PDF document text
    • http://modero.vn/upload/files/zizuduji.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/mixezurekiduvunu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 10616 bytes
SHA-256: 3ee2824de61cfe6e64b4b38bb6c3028384d934fafd21a4ad8bc26ea4913e9891
font_02_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16928 bytes
SHA-256: 2ba799853ce37af6d27cf81b9df761a13118e478248a2c924a6bd2acdc9391ac